Portable and adjustable scaffold.



No. 668,!527. Patanted'i-eb. 26, |9 0l'.

' c. s. snow.

PORTABLE AND ADJUSTABLESGAFFDLD.

A nmio'n filed Aug. Is, 1900.

(No Model.)

WWW

W I I ,hereinafter set forth,

' Nm; ST TES CHARLES S. CROW, OF FRENDALE, IOWA.

PORTABLE AND ADJUSTABLE soA F'oto.

SPECIFICATION forming part of Letters Patent N o. 668,627, dated February 26,] 901.

' Application filed August 13, 1900. Serial-No. 26,684. \No model.

To all whom, it may concern:

Be it known that I, CHARLES S. GROW, a citizen of the United States, residing at Frendale, in the county of'Johnson and State of Iowa, have invented a ne'wand useful Portable and Adj iistable Scaifold fol-Bricklayers, the, of which the following is aspecification.

My object is to provide portable standards and adjustable platform-supports to facilitate setting up, adjusting, and taking down scaffolds when used for building walls, painting, paper-hanging, and other various purposes for whichscaffolds are require My invention consists in'the construction, arrangement, and combinatio'n'of parts, as pointed out in my claim, and illustrated in the accompanying drawings, in which-- I Figure 1 is a side elevation of one of my portable standards and platform-supports and the mechanism for raising and lowering the platform-supports. Fig. 2 is a top View of a pair of standards and platform-supports in position as required to'be connected by means of movable planks, as indicated by dotted lines and as required for supporting materials and persons at different'points of elevation at different times.

The letter A designates a wooden standard, about ten feet high and four inches square, to which are fixed at its bottom and in parallel position with each other two mating horizontal straight pieces 13 to serve as a base to support the standard in an upright posi-- tion. These mating pieces are about six feet long and two by four inches in size and jointly fixed to the bottom of the standard by means of screw bolts and nuts or in any suitable way. A single upright having an extended base and a platform fitted thereto and supported by braces fixed to its ends and to a collar slidably connected with the upright is thus advantageously constructed and adapted for connecting hoisting mechanism with the upright and platform for producing a scaffold adapted to be adjusted by persons on the scaifold. Braces O are fixedebetween the ends of the mating base-pieces B and to the standard A. A rackl) is fixed to one of the parallelfaces of the standard A. Two

produce a frame and platform-support adapted to be slidably connected with the standard A, as shown in Fig. l. A pinion H is jonrnaled between the mating parts F of the frame to engage the rack D and a roller-J to engage the plane face of the standard A. A worm K in bearings fixed to the mating pieces F engages the pinion H in such a manner that when the worm is operated by means of a crank-handle m the platform-support can be raised and lowered thereby as required to adjust the platform relative toihe standard A.

A ratchet n,.fixed to the worm, and apawl n, pivoted to the platform-support, serve as a means for locking the Worm as required to retain the platform-support at any point of elevation desired.

P is a collar adapted to move up and down on the standard A, and braces R, fixed to the collar, are also fixed to the end portions of the platform-supportto aid in retaining the platform level while in motion or at rest. An antifriction-roller s is journaled in the end of the collar P to engage theplain face of the standardA, as required to prevent friction and to facilitate the up-and-dowu movements of the collar and platform-supports.

Inthe practical use of my invention I place two of the standards and platform-supports in such position as desired, inside or outside of a building, and then'place planks upon the platform-supports to extend over both, as indicated by dotted lines in Fig. 2, and to raise or lower them I operate the worms that v engage the racks.

Having thus described the constructionan'd operationiof my invention, its practical utility will be readily understood by personsfamiliar with the art to which it pertains.

What I claim as new, and desire to secure by Letters Patent, is-

In a portable and adjustable scafiold, an upright having an extended fixed base anda fixed rack on one of its faces, a platform-support consisting of an oblong frame fitted to the upright, a pinion journaled to the platform-support to engage the fixed rack, a roller ratchet wheel, I a. collar slidahly connected with the upright below the frame and braces fixed to the collar and to the ends of the frame, all arranged and combined as shown and described for the purposes stated.

v CHARLES S. CROW.

Witnesses:

FRED H. CROW, J. H. ROHUT. 

